What is the normal rating for the auxiliary terminals on an electric sequencer?

The correct choice indicates that the normal rating for the auxiliary terminals on an electric sequencer is typically 24 volts and 0.5 amps. This rating is significant because it aligns with standard control voltage levels used in many HVAC applications, particularly in heating systems that employ electric sequencers.

Electric sequencers are used to control multiple electric heat sources, turning them on and off in a staged manner to manage heating loads effectively and optimize energy consumption. The 24-volt rating is particularly common in the industry, as it ensures low voltage operation that is safer for control circuits, helping to prevent electrical shock while providing sufficient voltage to control relays and contactors.

Moreover, the current rating of 0.5 amps is adequate to handle the small control loads and signals needed to activate the sequencer’s outputs, ensuring proper operation without risking overloading the circuit, which could lead to failures or safety hazards.

Understanding this rating is crucial for technicians, as it directly affects the design and function of HVAC control systems, ensuring that they operate efficiently and safely.